1 [ESRI software] In a geodatabase, the point representing the beginning or ending point of an edge, topologically linked to all the edges that meet there.
2 [ESRI software] In a coverage, the beginning or ending point of an arc, topologically linked to all the arcs that meet there.
3 [data structures] In a TIN, one of the three corner points of a triangle, topologically linked to all triangles that meet there. Each sample point in a TIN becomes a node in the triangulation that may store elevation z-values and tag values.
4 [mathematics] In graph theory, any vertex in a graph.
5 [hardware] The point at which a computer, or other addressable device, attaches to a communications network.